PsyCon: Psychrometric Constant (gamma)
Description
PsyCon returns the value of psychrometric constant.
Usage
PsyCon(P, lambda = 2.45, c_p = 1.013 * 10^(-3), eps = 0.622)
Value
The function returns the value of the psychrometric constant [kPa/C] as a numeric scalar.
Arguments
- P
A numeric scalar that denotes the atmospheric pressure [kPa].
- lambda
A numeric scalar that denotes the latent heat of vaporization, 2.45 [MJ/kg].
- c_p
A numeric scalar that denotes the specific heat at constant pressure, 1.013*10^(-3) [MJ/(kg*C).
- eps
A numeric scalar that denotes the ratio molecular weight of water vapour/dry air = 0.622.
Reference
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998).
Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56.
Fao, Rome, 300(9), D05109.
Details
This is a function to calculate the psychrometric constant [kPa/C].